The spot erase feature is still a little tricky to use I think. Now, in Live Recording mode, when you hold a key, it gets deleted. It's really easy to accidentally delete notes when recording fast patterns (with sloppy timing). Also, it means that you always first add a note to delete it again in the second pass. I think it would be better to only delete notes when you press the delete button and a key. EG: Sequencer playing, Live recording on. Hold Clear. Nothing happens. Still holding Clear, press A1, A1 gets deleted until you release either A1 or Clear.

Let's say you press GP3 button (fill start) for two seconds, that would invoke FILL mode ( "FILL" flashing above the steps), without (or not?) releasing GP3 press GP11 (fill end) to set the end of the steps to be auto filled: steps 3 to 11.